ICO is the Windows icon format for app icons and website favicons. It can hold several sizes in one file.
ICO is used by Windows and browsers; icon editors can open and export it.
Crisp icons at every required size.
Browser-tab and bookmark icons.
Cursors, toolbars and system glyphs.
| ✔ Strengths | ✖ Limitations |
|---|---|
| Supports transparency | Less common outside its niche |
Convert, compress and edit — free, in your browser.
Remove the background from ICO images, upscale to 4K, or generate new visuals with SharkFoto AI.
ICO is the Windows icon format for app icons and website favicons. It can hold several sizes in one file.
ICO is used by Windows and browsers; icon editors can open and export it.
ICO is optimised for its specific use rather than strictly lossless storage.
Use SharkFoto's free tools — upload your ICO file and convert it to a more convenient format in seconds. It's free, processed securely and never stored.
Yes — ICO supports transparent backgrounds.